Enable dynamic tool output truncation by default (#225)

- Changed truncate_all_tool_outputs default from false to true
- Updated schema documentation to reflect new default
- Added entry in README experimental features table
- Regenerated JSON schema

This prevents prompts from becoming too long by dynamically
truncating output from all tool calls, not just whitelisted ones.
Feature is experimental and enabled by default to help manage
context window usage across all tools.

Co-authored-by: sisyphus-dev-ai <sisyphus-dev-ai@users.noreply.github.com>

src/config/schema.ts

@@ -114,7 +114,7 @@ export const ExperimentalConfigSchema = z.object({
   preemptive_compaction: z.boolean().optional(),
   /** Threshold percentage to trigger preemptive compaction (default: 0.80) */
   preemptive_compaction_threshold: z.number().min(0.5).max(0.95).optional(),
-  /** Truncate all tool outputs, not just whitelisted tools (default: false) */
+  /** Truncate all tool outputs, not just whitelisted tools (default: true) */
   truncate_all_tool_outputs: z.boolean().optional(),
 })